Quartz fibre strengthen Bis maleimide BMI composite material have low to dielectric loss angle, able to bear high temperature, damp and hot, good mechanics performance.

In view of the characteristics that the dissolving temperature of quartz is low in the firing process of feldspar ceramics, the paper advances the practical formula to calculate the residue quartz.

The affecting factors of low value by activation energy determination include heating duration in low temperature stage, pureness of K feldspar and mixture of some plagioclase, quartz et al.